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| author | stainer_t <thomas.stainer@oecd-nea.org> | 2025-09-08 13:48:49 +0200 |
|---|---|---|
| committer | stainer_t <thomas.stainer@oecd-nea.org> | 2025-09-08 13:48:49 +0200 |
| commit | 7dfcc480ba1e19bd3232349fc733caef94034292 (patch) | |
| tree | 03ee104eb8846d5cc1a981d267687a729185d3f3 /Dragon/src/BRESS1.f | |
Initial commit from Polytechnique Montreal
Diffstat (limited to 'Dragon/src/BRESS1.f')
| -rw-r--r-- | Dragon/src/BRESS1.f | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Dragon/src/BRESS1.f b/Dragon/src/BRESS1.f new file mode 100644 index 0000000..36527b6 --- /dev/null +++ b/Dragon/src/BRESS1.f @@ -0,0 +1,71 @@ + SUBROUTINE BRESS1(ITRIAL,XX,DIFF,SIGR,SIGT,A11) +* +*----------------------------------------------------------------------- +* +*Purpose: +* Assembly of leakage system matrices for the nodal expansion method. +* +*Copyright: +* Copyright (C) 2021 Ecole Polytechnique de Montreal +* This library is free software; you can redistribute it and/or +* modify it under the terms of the GNU Lesser General Public +* License as published by the Free Software Foundation; either +* version 2.1 of the License, or (at your option) any later version +* +*Author(s): A. Hebert +* +*Parameters: input +* ITRIAL type of base (=1: polynomial; =2: hyperbolic) +* XX mesh width. +* SIGR macroscopic removal cross section. +* SIGT macroscopic cross section. +* +*Parameters: output +* A11 nodal matrix. +* +*----------------------------------------------------------------------- +* +*---- +* SUBROUTINE ARGUMENTS +*---- + INTEGER ITRIAL + REAL XX,DIFF,SIGR,SIGT,A11(4,4) +*---- +* WEIGHT RESIDUAL EQUATIONS +*---- + A11(:4,:4)=0.0 + DX2=XX**2 + ETA=XX*SQRT(SIGR/DIFF) + A11(1,1)=SIGT/12.0 + A11(2,2)=SIGT/20.0 + IF(ITRIAL == 1) THEN + A11(1,3)=-SIGT/120.0-DIFF/(2.0*DX2) + A11(2,4)=-SIGT/700.0-DIFF/(5.0*DX2) + ELSE IF(ITRIAL == 2) THEN + ALP1=ETA*COSH(ETA/2.0)-2.0*SINH(ETA/2.0) + ALP2=((12.0+ETA**2)*SINH(ETA/2.0)-6.0*ETA*COSH(ETA/2.0))/ETA + A11(1,3)=SIGT*ALP1/(ETA**2)-DIFF*ALP1/DX2 + A11(2,4)=SIGT*ALP2/(ETA**2)-DIFF*ALP2/DX2 + ENDIF + ! LEFT CURRENT CONDITION + A11(3,1)=-DIFF/XX + A11(3,2)=3.0*DIFF/XX + IF(ITRIAL == 1) THEN + A11(3,3)=-DIFF/(2.0*XX) + A11(3,4)=DIFF/(5.0*XX) + ELSE IF(ITRIAL == 2) THEN + A11(3,3)=-(DIFF/XX)*ETA*COSH(ETA/2.0) + A11(3,4)=(DIFF/XX)*ETA*SINH(ETA/2.0) + ENDIF + ! RIGHT CURRENT CONDITION + A11(4,1)=-DIFF/XX + A11(4,2)=-3.0*DIFF/XX + IF(ITRIAL == 1) THEN + A11(4,3)=-DIFF/(2.0*XX) + A11(4,4)=-DIFF/(5.0*XX) + ELSE IF(ITRIAL == 2) THEN + A11(4,3)=-(DIFF/XX)*ETA*COSH(ETA/2.0) + A11(4,4)=-(DIFF/XX)*ETA*SINH(ETA/2.0) + ENDIF + RETURN + END |